Which US Currency Denomination Will Be Redesigned Next?

The new(ish) purple and green five dollar bill was released into circulation this year. The makeover was actually an attempt to foil counterfeiters and includes two new watermarks and an enhanced security thread that will help businesses and consumers validate the new bills.

Do you know which currency denomination is slated for a redesign next?

Jenn, the $10 has already been redesigned. It's yellow with some red images.
I like the redesigns. I am confused by the move to update the $100 dollar bill though, since that was the bill to kick off the current redesigns. Maybe it wasn't as effective at preventing counterfeiters as they had wanted?
I wonder when they'll update the $1 bill. Or are they going to try removing it for the coin in the future?

Hmm... I kinda like the redesign of the $20 bill a little bit better than the $5. My friend has commented that she thinks we're heading towards the whole Euro look with the fancy colors and whatnot. LOL.

i guess it's about time that our currency got a nice little upgrade since ours is possible the least colorful of all that are out there. i would have thought that you were referring to the penny since we know that it's going to get a change soon, but i guess it's a bill that we're talking about in this case.